package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;


import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;


public class RefreshTokenInterceptor implements HandlerInterceptor {

    private final StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1、获取请求头里面的token
        String token = request.getHeader("Authorization");
        if(StrUtil.isBlank(token)){
            return true;
        }
        //2、基于token获取redis中的用户
        String key = RedisConstants.LOGIN_USER_KEY + token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash()
                .entries(RedisConstants.LOGIN_USER_KEY + token);
        //3、判断用户是否存在
        if (userMap.isEmpty()){
            return true;
        }
        //5、将查询到的用户转换为UserDTO
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap,new UserDTO(), false);
        //6、存在 将用户信息放到threadLocal中去
        UserHolder.saveUser(userDTO);

        //7、刷新token有效期
        stringRedisTemplate.expire(key,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        //8、放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
        //移除用户
        UserHolder.removeUser();
    }
}
